Can anyone please give me some idea about this USACO problem? DELIVER — Delivery Route
Here is the editorial of the problem but I could not understand why 5N nodes are required.
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Can anyone please give me some idea about this USACO problem? DELIVER — Delivery Route
Here is the editorial of the problem but I could not understand why 5N nodes are required.
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because you have to build 4n points (up, down, left and right) and themselves, 5n in total.
But why it is enough to consider only the right-angled paths?